<script>
    var arr = ['鹿晗', '王俊凯', '蔡徐坤', '彭于晏', '周杰伦', '刘德华', '赵本山']
    cup = arr[0]
    arr[0] = arr[h = arr.length - 1]
    arr[h] = cup
    alert(arr)
</script>